The function and importance of blockchain oracles in DeFi

Smart contracts are the foundation of many projects within the decentralised finance (DeFi) industry. However, they require data to see if conditions are met to issue commands. Most of the time, these smart contracts are limited by their respective blockchains but oracles help them widen their scope beyond the network.

Oracles are some of the most vital elements in the crypto industry. They allow DeFi projects to operate independently without being restricted by access to all kinds of information. Another interesting part about oracles is that there is a wide variety of them that work differently from one another. Learn all of those details with this guide from Gamdom:

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What is a blockchain oracle and why is it important?

Blockchain oracles are entities that gather information from all kinds of sources, including real life. The information they gather is highly specific to what kind of oracles they are and what the smart contracts need from them. That way, smart contracts can be formed with conditions set that can only be met outside of the blockchain that it is created on. 

The problems oracles solve to improve DeFi

Smart contracts are one of the building blocks of the Web 3.0 ecosystem but they are only available in blockchains like Ethereum (ETH). This means that they cannot be created outside of a DeFi environment, thereby limiting their information gathering only to entities in the same network. 

That is the problem oracles aim to solve. Using crypto oracles, smart contracts liaise between two transacting entities even if they are from separate networks. Likewise, it also enables decentralised apps (dApps) to update or react using off-chain information. 

How oracles gather data

Oracles gather data using a wide variety of means. They can use hardware, software, and even other blockchains then deliver what information they gather to a smart contract. However, smart contract oracles can do all of them at once. They have to be designed to function a certain way. Otherwise, they can’t gather all kinds of information from everywhere at once. 

Different kinds of blockchain oracles and their uses

There is a large variety of oracles in blockchain but their differences are often made to serve a specific purpose. However, they can still be grouped into four types like the following:

Input and output oracles: Allows smart contracts to use data off-chain

Input and output oracles are separate entities that serve complementary functions. Smart contracts that act based on conditions set outside of the blockchain need input oracles. These fetch off-chain data then delivers it to the smart contract. On the flip side, output oracles deliver commands from the smart contract to entities outside of the blockchain. 

Both of these entities work hand-in-hand in the Internet-of-Things (IoT). Sensors can deliver real-life data like the humidity of your lawn. This information is delivered to the smart chain through input oracles which will then trigger a response. It will be delivered to other appliances by an output oracle like turning on the sprinkler.

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Cross-chain oracles: Allows smart contracts to use data from other chains

Bitcoin (BTC) is in a separate network from Ethereum (ETH). Thus, accounts from both sides cannot interact with each other unless either side converts their assets into one that circulates the other. Cross-chain oracles can liaise their transactions so that both sides. 

This is useful for making smart chains designed for investors who have invested in both networks. That means they can use a dApp on Ethereum to automate buying and selling of Bitcoin according to market trends. It’s a useful feature that allows traders to be hands-off about their investments, allowing them to focus on other matters as businessmen. 

Contract oracle: Smart contract gathers data from a specified contract

Some commands take more than one smart contract to operate. In this case, the user can have multiple contracts work together to issue a command with nuanced conditions. An example of this is practice when a dApp keeps track of a user’s actions. 

Every decision made on a platform is evaluated based on the user agreement and service policies written in smart contracts. If the action is not aligned with either of these, then the smart contracts issue to consult another smart contract for what kind of action needs to be taken. This creates a loop that ultimately ends with the user’s decision being addressed by the dApp. 

Human oracles: Smart contract uses data input manually

Oracle in crypto is usually designed to be independent from people. However, there are some smart contract actions that require human input, especially with sensitive data like personal information. That includes name, address, and phone number which is common among dApp registrations. Human oracle is what enables this interaction. 

The crypto community has one big concern over oracles

The main concern the Web3.0 community is currently trying to innovate to solve is the inherent potential for centralisation of a smart contract oracle. Its provider has the prerogative to set a hierarchical system, classifying its users and giving certain groups priority over others. Such a system will ultimately conflict with the idea of DeFi where every user is treated equally. 

To put it into perspective, here is an example for gamblers. You can set a smart contract to deposit ETH or any Ethereum-based asset to your Gamdom account if your bankroll reaches a certain threshold. If you are a low-ranked user of a centralised oracle, then your deposit could be delayed in favour of prioritising higher-ranked users. 

Opting for a priority-based system will make exchanges liaised by oracles become unusable for lower-ranked users the bigger the platform grows. That’s why developers are further innovating the blockchain oracles in a way that ensures it remains DeFi. 

FAQs

Here are some of the most frequently asked questions about oracles in crypto:

Why are oracles important to crypto?

Smart contracts need information to issue commands like deposit/withdrawal of crypto. An oracle allows it to use off-chain information to set the conditions. This way, your smart contracts help your crypto trades even for platforms outside of the blockchain.

What are oracles in blockchain?

Oracles are data gatherers and messengers for smart contracts. They are the entities that dictate whether or not specified conditions are met. How oracles gather information depends on its type and what kind of data it is trying to gather. 

What are examples of uses for oracles?

A good example of oracle use is the internet-of-things (IoT). This is a Web3.0 system where house appliances and sensors are connected to a smart contract through various input oracles. If the information gathered meets the smart contract’s conditions, then it will issue a command through output oracles like activating an electronic. 

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